Sen. Joe Biden was chosen Saturday as Barack Obama's running mate.
Biden brings to the table an ability to speak knowledgeably about issues ranging from foreign policy to to the country's domestic agenda.
The Delaware senator has held two of the most important jobs in Washington: chairman of the Senate Judiciary Committee and chairman of the Senate Foreign Relations Committee. That could be reassuring to voters who worry about Obama's inexperience in national and world affairs.
Biden also has been an early and vociferous critic of President Bush's foreign policies, most notably regarding the war in Iraq.
He voted for the authorization to invade Iraq but conceded that it was a mistake. Obama opposed the authorization, and that gap might give Republicans something to highlight.
Nonetheless, his political experience spans 36 years, and some say that will create a problem for Obama's key talking point of change.
Obama has routinely criticized his GOP rival for being a Washington insider. McCain has charged that Obama is too inexperienced to run the country, especially its international affairs.
So how does Biden help Obama politically? Biden is Roman Catholic. There are nearly 70 million Roman Catholics in the United States, about 20 percent of the electorate, and they can tip the balance in a close contest.
Biden also has roots in Pennsylvania, a swing state. Obama lost the state to Sen. Hillary Clinton in the primaries. Biden's support could help the campaign win the state in November.
"You're getting national security experience, you're getting enthusiasm, and you hope you're getting some help in those white, working-class, blue-collar towns where Barack Obama needs help," CNN Senior National Correspondent John King said.
"The rap on him is that he talks too long, his speeches don't end, and occasionally he goes off the reservation," King added.
CNN Senior Political Correspondent Candy Crowley says Biden is a "very one-on-one person" and "has a personal story as well: triumph over tragedy. ... He brings depth to this ticket."
Biden, 65, was first elected to the Senate at age 29 in 1972. Shortly after, his first wife and daughter were killed in a car accident. He weighed resigning but eventually decided to continue with his political career.
Who would have thought that the young "Washington outsider" and "agent of change", one term Senator Barack Obama, would choose a long time "Washington insider" and the epitome of "Washington politics", Senator Joe Biden, as his VP running mate? Who would have thought that the elderly "Washington insider" and GOP maverick, Senator John McCain, would choose a one term Governor and forty four year old mother of five children, the epitome of a "Washington outsider" as his VP running mate. Talk about political flip flopping! Now Obama can't talk about McCain as "politics as usual" and McCain can't talk about Obama as not ready to be Commander In Chief. Obviously both Obama and McCain are going after the blue collar, women and evangelical vote. Both Obama and McCain are politically "running to the center" to capture Independent voters and by November there won't be a lick of difference in their ever changing energy and tax policies, as I see it. Iraq withdrawal is no longer an issue, now that the Bush Administration as signed a deal to be out by 2011. Therefore rest assured there will be a lot of negative campaigning and political "mudslinging" from both Obama and McCain, from both Biden and Palin. In the end, it will all boil down to "image" and how voters perceive the messengers ,not the message. Style will triumph over substance , whether Obama or McCain wins the election. If you really want "change you can believe in" and politics truly outside of Washington, vote for your values instead of the "lesser of two evils". Choose substance over style, genuine change over cosmetic change and vote for a third party that embodies your principles. We don't have to flip flop with Barack Obama and John McCain.